Add LLM endpoints, web frontend, and rate limiting config

- Added OpenAI-compatible LLM endpoints to API backend - Introduced web
frontend with Jinja2 templates and static assets - Implemented API proxy
routes in web service - Added sample db.json data for items, users,
orders, reviews, categories, llm_requests - Updated ADC and Helm configs
for separate AI and standard rate limiting - Upgraded FastAPI, Uvicorn,
and added httpx, Jinja2, python-multipart dependencies - Added API
configuration modal and client-side JS for web app

helm/api7ee-demo-k8s/templates/configmap-adc.yaml

@@ -47,11 +47,11 @@ data:
               port: 80
               weight: 100
         routes:
-          - name: nginx-api-route
+          - name: nginx-api-llm-route
             uris:
-              - /api
-              - /api/*
-            priority: 10
+              - /api/llm
+              - /api/llm/*
+            priority: 20
             plugins:
               {{- if .Values.api7.tls.enabled }}
               redirect:
@@ -65,6 +65,25 @@ data:
                 limit_strategy: {{ .Values.api7.plugins.aiRateLimit.limitStrategy | quote }}
               {{- end }}
 
+          - name: nginx-api-route
+            uris:
+              - /api
+              - /api/*
+            priority: 10
+            plugins:
+              {{- if .Values.api7.tls.enabled }}
+              redirect:
+                http_to_https: true
+              {{- end }}
+              {{- if .Values.api7.plugins.rateLimit.enabled }}
+              limit-count:
+                count: {{ .Values.api7.plugins.rateLimit.count }}
+                time_window: {{ .Values.api7.plugins.rateLimit.timeWindow }}
+                rejected_code: {{ .Values.api7.plugins.rateLimit.rejectedCode }}
+                key_type: {{ .Values.api7.plugins.rateLimit.keyType | quote }}
+                key: {{ .Values.api7.plugins.rateLimit.key | quote }}
+              {{- end }}
+
     {{- if .Values.api7.plugins.auth.enabled }}
     consumers:
       {{- range .Values.api7.consumers }}